Cryptomenysis patefacta; or, The art of secret information disclosed without a key. Containing, plain and demonstrative rules, for decyphering all manner of secret writing. With exact methods, for resolving secret intimations by signs or gestures, or in speech. As also an inquiry into the secret ways of conveying written messages, and the several mysterious proposals for secret information, mentioned by Trithemius, &c

by

Falconer, John, decipherer; J.F; F., J; Steuart, of Allanton (bookplate)